Abrading-block and carrier therefor.



R. GARDNER.

ABRADING BLOCK AND CARRIER THEREFOR.

APPLIOATION FILED rm. 14, 1908.

Patented Sept. 20, 1910.

UNITED STATES PATENT OFFICE.

ROLAND GARDNER, OF CLEVELAND, OHIO.

ABRADING-BLOCK AND CARRIER THEREFOR.

To all whom it may concern:

Be it known that I, ROLAND GARDNER, a subject of the King of England,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Abrading- Blocks andCarriers Therefor; and I hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same.

This invention relates to improvements in abrading blocks for dressingmarble, plateglass and the like.

The object of this invention is to provide a block of such form that itwill be both suitable for use as a hand block and for mounting on awheel or carrier.

A further object of my invention is to provide a block which willfacilitate the dressing of the material, enabling the same to beaccomplished in much shorter time than is possible with the ordinaryform of block.

My invention also consists in the features of construction andcombination of arts as described in the specification, pointe out in theclaim and illustrated in the accompanying drawings.

In the accompanying drawings Figure 1 is a perspective view of one ofthe blocks as used for dressing a surface by hand. Fig. 2 shows aplurality of blocks mounted on a wheel or carrier. Fig. 3 is a sectionon line 3--3, Fig. 2. Fig. 4 is a section on line 44, Fi 3.

Kgain referring to the drawings, and especially to Fig. 1, 2 representsone of the blocks, which is elliptical-shaped in cross section, and hasa central opening or aperture 3 extending therethrough which is alsopreferably elliptical in shape, so that the walls of theblock areeverywhere of the same thickness. The shape of this block permits it tobe readily grasped in the hand and when held flat on the surface whichis to be smoothed or polished the outer edge serves to cut off anyprojections on the surface of the material which is being dressed andthe face of the block smooths and polishes the same. The comparativenarrowness of the face of the block causes the same to wear evenly andpro ortionately with the outer edge so that t e block is always incondition to do effective work.

Specification of Letters Patent.

Application filed February 14, 1908.

Patented Sept. 20, 1910.

Serial No. 415,880.

When a machine is used for dressing the material which is to be smoothedor polished a plurality of the blocks are mounted on a carrier or wheel.The blocks are arranged in two series, the blocks in one series beingsmaller than the blocks in the other series. The larger blocks extendradially from near the center to the perimeter of the carrier and thesmaller blocks are arran ed in the spaces between the larger blocks annear the perimeter of the carrier. The ortions of thelarger grindingblocks near t 1e perimeter of the carrier, of course, travel over agreater surface than the portions near the center of the carrier andtherefore do more work and would wear away proportionately faster, butby providing the smaller blocks near the pnimeter between the outerportions of the larger blocks the wear on the larger blocks is to acertain extent equalized so that the blocks wear evenly.

Referring particularly to Figs. 2, 3 and 4 of the drawings, 4 representsthe wheel or carrier which is provided with ears or lugs 4 by means ofwhich the carrier may be secured to a driving shaft (not shown). In thecarrier are formed a series of large elllptical-shaped openings 5 whichpreferably extend radially from near the center of the perimeter of thecarrier, and a series of smaller elliptical-shaped openings 6, which arearranged between the lar er openings and nearer to the perimeter o thecarr er. These openings of course are for permitting water to passthrough the wheel to the surface which is being round or polished. Onthe face of the wheel around each opening is formed an elliptical-shapedridge or flange 7 which constitutes a pocket for receiving an abradingblock. In the bottom of each pocket is arranged an elliptical-shapedplate 8 having an opening corresponding to the o ening in the bottom ofthe pocket. The p ate 8 has formed inte ral therewith a flange 10 whichextends d own at one side, adjacent to the wall of the pocket which isin advance when the wheel is rotated and said flange 10 projects adistance below said wall. In the wall of each pocket where the flange 10extends down is formed a screwthreaded opening 11 for a clamping screw12, which when screwed in en ages the flange and thereby clamps theblock between the flange and the opposite wall of the pocket. In theback of each pocket are formed screw-threaded openings 14 in which arearranged adjusting screws 15 by means of which the abrading block can beadjusted outwardly to compensate for the wear on the working facethereof.

When operating the wheel the faces of the abrading blocks are broughtinto contact with the marble or other surface which is to be ground orpolished and the wheel revolved in the direction indicated by the arrow.As the wheel is revolved the material removed from the surface which isbeing ground will of course be driven in front of the blocks and in theordinary construction would act to uselessly wear away the front sidesof the blocks but the flanges 9 serve as shields which protect theabrading blocks from the action of the refuse material. Also owing tothe curvature of the blocks the waste material is shed or driven toeither side thereof leaving the path of the block comparatively freefrom the refuse material.

The blocks are shown arranged radially on the carrier but thedlsposltion of the blocks can be changed without departing from theessential features of my invention.

What I claim is,-

In an abrading wheel the combination of a carrier plate provided with aseries of openings extending from near the center of the plate to theperimeter thereof and a series of smaller elliptical-shaped openingsarranged near the perimeter of the plate between said first-mentionedopenings, each opening having its longer axis extending radially, apocket formcdaround each opening and an elliptical-shaped ahrading blockprovided with an opening extending celitrally there'through mounted ineach pocket, for the purpose set forth.

In testimony whereof, I sign the foregoing specification, in thepresence of two witnesses.

ROLAND GARDNER.

\Vitnesses VICTOR C. LYNUII, N. L. MoDoNMcLL;

